US5299038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
LCD with heat conductor from light source to separate portion of light guide
Assignee: Toshiba Corp
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Filing: 1992-01-28
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Granted: 1994-03-29
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Expires: 2012-01-28
Abstract
Abstract In an LCD (Liquid Crystal Display) module, a light-guide plate is arranged on a side opposite to a display surface of an LCD panel, and cold-cathode tubes are provided to two sides of the light-guide plate Light generated by the cold-cathode tube is uniformly radiated on the LCD panel through the light-guide plate. The cold-cathode tubes generate heat together with light A panel cover is arranged to prevent heat from dissipating to the outside. Heat is conducted to part or an entire portion of the light-guide plate by using a heat conducting plate or the like
Inventors
- 👤 Hiroshi Hamada
- 👤 Katuyuki Kanbara
- 👤 Shuichi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133382; G02F1/133385
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
An LCD module comprising: an LCD panel having a display surface for displaying information; a light source provided close to one side of the LCD panel; a light guide plate, provided adjacent to a surface opposite to the display surface of the LCD panel, for guiding light generated by the light source to the display surface of the LCD panel; a heat conducting plate in contact with a selected portion of said light guide plate preferentially guiding heat generated by the light source to said selected portion of said light guide plate to provide a uniform temperature distribution across the LCD panel, said selected portion being spaced from said light source; and covering means for covering both the light guide plate and the heat conducting plate and for preventing heat generated by the light source from dissipating.
Claim 2
Dependent Claim
137 words
An LCD module comprising: an LCD panel having a display surface for displaying information; a light source provided close to one side of the LCD panel; a light guide plate, provided adjacent to a surface opposite to the display surface of the LCD panel, for guiding light generated by the light source to the display surface of the LCD panel; a heat conducting plate in contact with a selected portion of said light guide plate preferentially guiding heat generated by the light source to said selected portion of said light guide plate to provide a uniform temperature distribution across the LCD panel, said selected portion being spaced from said light source; and covering means for covering both the light guide plate and the heat conducting plate and for preventing heat generated by the light source from dissipating.
Claim 3
Dependent Claim
27 words
The LCD module according to claim 1, wherein the heat conducting plate comprises a member having a high heat conductivity, such as an aluminum or copper plate.
Claim 4
Dependent Claim
20 words
The LCD module according to claim 1, wherein the covering means covers the light source and the light guide plate.
Claim 5
Dependent Claim
28 words
The LCD module according to claim 1, further comprising: a second heat conducting plate which is in contact with both the light source and the light guide plate.
Claim 6
Dependent Claim
126 words
An LCD module comprising: an LCD panel having a display surface for displaying information; a light source provided close to one side of the LCD panel; a light guide plate, provided adjacent to a surface opposite to the display surface of the LCD panel, for guiding light generated by the light source to the display surface of the LCD panel; and covering means for covering the light guide plate and the light source, said covering means having a portion in contact with a selected portion of the light guide plate preferentially guiding heat generated by the light source to said selected portion of the light guide plate to provide a uniform temperature distribution across the LCD panel, said selected portion being spaced from said light source.
Claim 7
Dependent Claim
126 words
An LCD module comprising: an LCD panel having a display surface for displaying information; a light source provided close to one side of the LCD panel; a light guide plate, provided adjacent to a surface opposite to the display surface of the LCD panel, for guiding light generated by the light source to the display surface of the LCD panel; and covering means for covering the light guide plate and the light source, said covering means having a portion in contact with a selected portion of the light guide plate preferentially guiding heat generated by the light source to said selected portion of the light guide plate to provide a uniform temperature distribution across the LCD panel, said selected portion being spaced from said light source.
Claim 8
Dependent Claim
35 words
The LCD module according to claim 5, wherein said portion of said covering means in contact with said light guide plate includes one or more recessed portions sufficiently recessed to contact the light guide plate.
Claim 9
Dependent Claim
26 words
The LCD module according to claim 5, further comprising: a heat conducting plate which is in contact with both the light source and the covering means.
Claim 10
Dependent Claim
131 words
An LCD module comprising: an LCD panel having a display surface for displaying information; a light source provided close to one side of the LCD panel; a light guide plate, provided adjacent to a surface opposite to the display surface of the LCD panel, for guiding light generated by the light source to the display surface of the LCD panel; heat generating means adjacent to a selected portion of the light guide plate to preferentially heat the selected portion of the light guide plate to provide a uniform temperature distribution across the LCD panel, said selected portion being spaced from said light source; and covering means for covering the light guide plate, the light source and the heat generating means, and for preventing heat generated by the light source from dissipating.
Claim 11
Dependent Claim
131 words
An LCD module comprising: an LCD panel having a display surface for displaying information; a light source provided close to one side of the LCD panel; a light guide plate, provided adjacent to a surface opposite to the display surface of the LCD panel, for guiding light generated by the light source to the display surface of the LCD panel; heat generating means adjacent to a selected portion of the light guide plate to preferentially heat the selected portion of the light guide plate to provide a uniform temperature distribution across the LCD panel, said selected portion being spaced from said light source; and covering means for covering the light guide plate, the light source and the heat generating means, and for preventing heat generated by the light source from dissipating.
Claim 12
Dependent Claim
34 words
The LCD according to claim 8, wherein the heating generating means is constituted by a glass plate, said glass plate having a heat conducting wire which is in contact with the light guide plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |